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Proper motions of embedded protostellar jets in Serpens


Djupvik, AA and Liimets, T and Zinnecker, H and Barzdis, A and Rastorgueva-Foi, EA and Petersen, LR, Proper motions of embedded protostellar jets in Serpens, Astronomy & Astrophysics, 587 Article A75. ISSN 1432-0746 (2016) [Refereed Article]


Copyright Statement

ESO, 2016

DOI: doi:10.1051/0004-6361/201526532


Aims: We determine the proper motion of protostellar jets around Class 0 and Class I sources in an active star forming region in Serpens.

Methods: Multi-epoch deep images in the 2.122 μm line of molecular hydrogen, v = 1−0 S(1), obtained with the near-infrared instrument NOTCam on a timescale of 10 years, are used to determine the proper motion of knots and jets. K-band spectroscopy of the brighter knots is used to supply radial velocities, estimate extinction, excitation temperature, and H2 column densities towards these knots.

Results: We measure the proper motion of 31 knots on different timescales (2, 4, 6, 8, and 10 years). The typical tangential velocity is around 50 km s-1 for the 10-year baseline, but for shorter timescales, a maximum tangential velocity up to 300 km s-1 is found for a few knots. Based on morphology, velocity information, and the locations of known protostars, we argue for the existence of at least three partly overlapping and deeply embedded flows, one Class 0 flow and two Class I flows. The multi-epoch proper motion results indicate time-variable velocities of the knots, for the first time directly measured for a Class 0 jet. We find in general higher velocities for the Class 0 jet than for the two Class I jets. While the bolometric luminosites of the three driving sources are about equal, the derived mass flow rate out is two orders of magnitude higher in the Class 0 flow than in the two Class I flows.

Item Details

Item Type:Refereed Article
Keywords:stars: formation; ISM: jets and outflows; Herbig-Haro objects; ISM: kinematics and dynamics
Research Division:Physical Sciences
Research Group:Other physical sciences
Research Field:Other physical sciences not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Rastorgueva-Foi, EA (Dr Elizaveta Rastorgueva-Foi)
ID Code:115222
Year Published:2016
Web of Science® Times Cited:1
Deposited By:Mathematics and Physics
Deposited On:2017-03-10
Last Modified:2017-10-11
Downloads:194 View Download Statistics

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